You're a product of your time, it's quite obviuos from your post. Barrels often weren't uniform or of consistent diameters from bore to bore. Same thing can happen today with different barrel manufacturers.
What exactly did he post that got your ire all bent and twisted around the axle? Particularly when you quote him pointing out they also cautioned people to determine the proper bullet, while you swiftly say that we often still do that? I didn't see a hint of him suggesting that slugging chambers and barrels is a thing of the past.
Your inexperience is blatantly obvious.
You might take a little bit of caution before pointing at yourself stroking your long grey beard and assuming/presuming he's a downy cheeked youth who never saw a reloading press before early this morning. Or this decade.
We all have various levels of expertise. Some as wide and as shallow as piss on a plate. Others, a great depth of knowledge about a very narrow field of knowledge. Some of us somewhere in the middle.
And very few of us are perfect communicators when tapping away at their keyboards; if we were that precise and articulate in our language, we'd probably be collecting a paycheque to write, whether about guns or hunting or whatever. It doesn't hurt to extend a little bit of grace; perhaps the poster's sentence structure wasn't quite as perfect as it could have been. To extend some of that grace, maybe yours wasn't either. Maybe mine isn't now.
There were a lot of uneducated people around 50 years ago. Many here would be very surprised at the percentage of barely or even illiterate people around.
I remember the industrial workforce my father and grandfather worked in 50 years ago that I was joining. Knuckle dragging miners and underground tradesmen that worked beside them. I was happy to become the latest generation of knuckle dragging miner, except I went blasting. Boy, there sure was all kinds of math figuring out brisance, fracture, collars, calculating delays and firing sequences, reading drilling and loading blueprints... all kinds of that formula stuff they hadn't even taught me back in Grade 3. Hard being an illiterate, strong backed knuckle dragger sometimes.
I remember how uneducated you had to be, practically illiterate in fact, to be a journeyman machinist, tool and die maker, millwright, carpenter properly building forms to take the concrete that would become the dam penstocks on the Columbia River, holding back millions of tons of water, etc.
The math for those trades was so easy I'm surprised they didn't just start them in the trades at whatever grade of elementary school they had a strong enough back and arms to pick up a tool belt. And the tech sheets and service data for the millwrights doing maintenance and overhall of Symons crushers, Pelton wheel electrical generators... any illiterate monkey could go through that.
And then there's the as-built blueprints they worked off, whether to machine a replacement part for a one-off piece of equipment, or to service it.
Must have been a hell of a hard time getting those illiterate, strong backs and weak minds tradesman to build the gantries and the spacecraft themselves that the truly smart guys designed for them to build so they could fly men to land on the moon. And reliable enough, properly built enough by those tradesmen, that it could then return safely back to earth.
Yep... mostly a society of illiterate, ignorant anybody can do it blue collar workers way back 50 years ago.
Y'know, as dumb as they were back then, and not worried about slip and fall lawsuit lawyers back then, the pages of the assorted hunting and shooting magazines were remarkably absent of many stories about how ol' Joe Six Pack, that dumb journeyman carpenter, blew his gun up in his face while on days off from building the forms for the concrete that would become the penstock for the W.A.C Bennett dam. Maybe they weren't as dumb and as dangerously adventurous back then as we might think. And maybe even today the majority aren't as dumb and as dangerously adventurous as some people think.
Only seen one gun blow up. Guy that did that was well into his 70's at the time. If I recall correctly, he had worked as one of Cominco's process techs from the concentrator until retirement. No strong back and weak mind there. But of course, as I don't believe in presenting an anecdotal event I witnessed as being representative of all, that's only a single observation that really doesn't prove the truly smart guys who can write letters after their name are the ones you can expect to blow themselves up.
The world of reloading is a complex place where most go their own unique way, following their personal muse. Extending a little grace makes the journey a lot more pleasant.
We now return you to your previously scheduled program.